/**
 * Created with IntelliJ IDEA.
 * Description:
 * User:何人亮
 * Date:2024-08-11
 * 11:16
 */


public class Test {
    public class TreeNode {
        int val;
        TreeNode left;
        TreeNode right;
        TreeNode() {}TreeNode(int val) { this.val = val; }
        TreeNode(int val, TreeNode left, TreeNode right) {this.val = val;
            this.left = left;
            this.right = right;
        }
    }
    public TreeNode invertTree(TreeNode root) {
        if(root==null){
            return root;
        }
        swap(root);
        invertTree( root.left);
        invertTree( root.right);
        return root;
    }
    public void swap(TreeNode root){
        TreeNode  cur=root.right;
        root.right=root.left;
        root.left=cur;
    }
}
